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The electric field near the surface of Earth points downward and has a magnitude of 150 N/C. What is the ratio of the magnitude of the upward electric force on an electron to the magnitude of gravitational force on the electron?
What charge must be placed on a plastic ball of mass 3.06 g therefore that the electric force balances the weight of the ball near Earth's surface?
You have a lens whose focal length is 12.7 cm. You place an object on the axis of the lens at a distance of 6.25 cm from it. How far is the object\'s image from the lens
Calculate the magnitude of the angular momentum of the Mars in a circular orbit around the sun. The Mars has mass 6.42×10^23 kg , radius 3.40×10^6 m , and orbit radius 2.28×10^11 m. The planet completes one rotation on its axis in 24.5 hours and one ..
An electron and a proton are eachaccelerated from rest in a uniform electric field of 2.0 ×105 V/m. What are their kinetic energies inJoules after they have each traveled a distance of 0.20 m in the electric field?
Hot chocolate effect. Tap a metal spoon inside a mug of water and note the frequency fi you hear. Then add a spoonful of powder (say, chocolate mix or instant coffee) and tap again as you stir the powder. The frequency you hear has a lower value f..
A 65- person stands on a scale in a moving elevator while holding a 5.0 mass suspended from a massless spring with spring constant 1.10. What is the reading of the scale on which the person stands
a circular wire of radius 5.19 cm has a current of 3.81 a flowing in it. the wire is placed in a uniform magnetic field
A uniform rope of mass m and length l is held with its lower end just touching the surface of a scale. Obtain the force of the scale on the rope just as the midpoint of the rope first touches the scale
While the microphone is inside the tube it may be at the center or close to the wall. How would it affect the measurement
a runner accelerates to a velocity of 5.30 ms due west in 3 s. his average acceleration is 0.643 ms2 also directed due
a straightforward method of finding the density of an object is to measure its mass and then measure its volume by submerging it in a graduated cylinder, What is the density of a 220 g rock
An 8g bullet is fired at a speed of 216 m/s into a 190 g block that is initially at rest at the edge of a table of 1m height. The bullet fully embeds itself in the block before the bullet-block system launches off the table. How far in the x-direc..
A brick is initially 8.20 cm high and an aluminum can is originally 8.21 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the similar height?
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